Cut-off-valve motion



NITED STATES PATENT OFFICE.

S. W. ROGERS, OF BALTIMORE, MARYLAND.

CUT-OFF-VALVE MOTION.

Specification of Letters Patent No. 9,488, dated December 21, 1852.

y To all whom t may concern.'

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Be it known that I, S. W. ROGERS, of the city of Baltimore and State of Maryland, have invented certain new and useful Improvements in Out-Oif Valves for Steam- Engines, and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming a part of this specification.

The nature of my invention consists in a particular arrangement for operating the cut oi'f valve.

A, A, A represent the steam ports and B the slide valve, the top of which is extended upward and recessed, as seen at a. A frame or truss O, is permanently secured to the steam chest or otherwise, through the top of which and immediately over the top of the slide valve and perpendicularly to the valve seat passes the rod D, to the lower end of which is hinged by a pin, so as to form a toggle joint, the levers E, which clasp and connect with the cut-off valve F on its two opposite sides by means of pins working loosely in the ears Z), cast thereon. The cut off valve F is of a hollow square form, so as to contain in its open part the slide valve, and of suticient length to close the steam port after the slide valve has moved to the extent of its motion. The rod G, is hinged to the projection on top of the slide valve, and the said valve is operated through said rod by one eccentric on the main shaft, or in any other well known The top part of the slide valve,

as before described, is recessed, leaving at each side the lugs c, and across said recess 1s passed a bar d, Figure 2, which 1s connected to the two arms or levers E. As the slide valve moves back and forth it carries with it to the extent of its motion the cut off valve, and just before the slide valve comes to a state of rest one of the lugs on the projection thereon strikes the bar CZ, connecting the arms of the brackets, throwing forward by a quick movement due to the leverage of the levers the cutoff valve which closes the steam port. As the levers pass and repass the center of the valve, the guide rod D rises and falls through the stuffing box on the truss or frame C, allowing the valves to move in their seats.

Instead of closing the cuto valve by the last of the movement of the slide valve the device which moves the bracket, and with it the cutoE valve, may be attached to the rod, itself, which would be essentially the same thing.

Having thus fully described my invention I do not claim placing the cutoff valve outside of the slide valve, and operating both valves by one rod or eccentric, but

I do claim- The lugs acting upon the hinged levers attached at their lower extremities to the cut-off slide and at their upper to a rod capable of vibratory movement in a direction perpendicular to the valve seat, substantially for the purpose and in the manner set forth, substantially as described.

In testimony whereof I have hereunto signed my name before two subscribing 

